Overedge sewing machine



ocx. 12,1926. 1,602,408

' A. GRIEB ET AL OVEREDGE SEWING' MACHINE Filed Sept. 27, 1923 2 Sheets-Sheet 1 i? sg ....g l .gf w m 11;2 I =`w E Oct, 12 192e.

A. GRIEB ET Al..

OVEREDGIE SEWING MACHINE Filed Sept. 27. 1923 2 Sheets-Sheet 2 INVENTOR BY n M Patented Get. l2, i925.

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ALFRED GRIEB, OF ELIZABETH, AND JOSEPH F.` PALME, NEWARK, NEXV TRSE'L ASSIGNRS TO THE SINGER MANUFACTURING COT/IPANY, OF ELIZABETH, NEW JERSEY, A. CORPORATION OF lNEVI JERSEY.

OVEREEGE SEWING MACHINE.

application inea' september 27, 1923. serial No.ec5`,e59.

This invention relates to improvements in stitch-forming mechanisms for Overedge sewing machines of the type wherein the thread carried by a work-penetrating eyepointed needle is enchained along` the margin ofthe work by a bearded needle.

The present intention-has for an object to improve the efiiciency of overedge sewing machines of this character by making possible a substantial increase'in the speed of operation thereof under reasonably quiet ruiming conditions. I

Another object of this invention is to pro- :vide an overedging machine of this character capable of producing overseams varying in width of bight to a substantial degree.

ln its preferred embodiment', the eyepointed and bearded needles are carried in adjustably spaced relation by a reciprocatory needle-bar. Cooperating with .the needles for carrying thread-loops `above and below the work from the eye-pointed needle to the thread-enchaining bearded needle are independently actuated upper and lower loop-spreaders disposed respectively above and below the cloth-plate of the machine. The lower spreader has simple vibratory movements derived from a grooved camcylinder mounted upon the needle-driving shaft, the operative elements for actuating` said lower spreader being capable of being connected in a plurality of predetermined positions to actuate said lower spreader in the necessary timed relationship with rey trating position of the needle 1a is fixed by spect to its cooperatingstitch-forming elements in the formation of a plurality Aof widths of bight of overseam. The upper spreader is sustained by a rocking carrier mounted uponra swinging arm of a bellcrank-lever, both the swinging movements of the arm and the rocking movements of the carrier upon said arm being derived in the present instance from cam-grooves `in the lower-spreader actuating cam-cylinder. ThD operation of the upper spreader can be definitely retimed for various widths of bight of overseam in a manner similar to that of the lower spreader. y

In the accompanying drawings, Fig. 1 is a longitudinal sectional view of a sewing machine embodying the present improvements. Fig. 2 is a top plan view of the machine, the front portion of the overhanging arm being broken away and the standard Referring to lthe drawings, the present improvement is embodied in a sewing machine of which the frame comprises a base 1 having a cloth-plate 2 and from which rises a hollow standard 3. of an overhanging bracket-armA t, terminating in a head 5i. Journaled for, rotation in suitable bearings provided in the bracket-arm l isa main or needle-driving shaft 6 carrying at one end a crank-disk 7 from which projects a crankrpin 8. The crank-pin 8 carries a roller 9 entering a needle-bar reciprocating camgroove 10 provided in a cam-block 11 clamped by sore-weas 12 upon a needle-bar 13. The needle-bar 13 is journaled forl endwise reoiprocation in suitable bearings provided inthe head 5 and carries at its lower end an leye-pointed work-penetrating needle 14 and a thread-enchaining bearded needle 15 disposed in adjustably spaced relation in a vertical plane substantially transverse to the direction of feed of the fabric.

In the present machine, thework-penesecuring it directly to the needle-bar by any suitable means. The bearded needle 15 mayn however, have a plurality of predetermined paths of operation. to form overseams of various widthsk of'bight. To this end the lshank of the needle 15 `may be inserted in any one of a plurality of apertures 150 formed in a needle-holder 151 and secured upon said holder by a set-screw 152. The needleholder 151 projects laterally from the needle-bar. 13, being secured thereupon by means of a set-screw 153.

Also journaled for vertical reciprocation in suitablebearings provided in the head` 5 is a spring-pressed presser-bar 16 carrying at its lower end a presser-foot- 17. A feedl' ing foot 18 is carried by a feed-bar 19 supported and actuated in any suitable or well known manner, whereby the feeding foot i, are

of y the y advances the worlr past the needles and rises and falls alternately with the presser-toot 17, the feeding foot as usual acting to advance the work in the raised position et the presser-t00t inasmuch as the particular form oit teed-actuating mechanism employed is immaterial, it is deemed unessential to an understanding oi the present invention to herein describe in detail the form employed.

Cooperating below the work with the needles 14 and is a lower spreader 20, the shank of which is secured by screws as in the soclietcd lateral arm 22 of a sleeve 23 liournaled for oscillatory movements upon a fulcrum-pin 24 suitably secured upon a depending lug 25 .on the machine frame. Another lateral arm 25 on the sleeve is apertured for the reception of a stud-screw 27 threaded into the arm 22 and which is embraced by the apcrtured end of a link 28. rlie other end ot the link is connected by means of a pivot-screw 29 'with the lower end of a rock-lever 30 havingl a plurality of.

link-connecting apertures, as 8l. rllhe r-oclrlever 30 is secured by means ot a screw 82 upon a pivot-pin 83 suitably journaled in the standard 3, the upper end et said rochlever carrying` a roller-stud 34 entering a cam-groove 35 ot a cam-cylinder 36 secured upon the main-shaft 6.

It will be understood that rotation ot the cam-cylinder 36 with the main-shaft 5 will impart rocking` movements to the lever 3G which movements are transmitted by the linlr 28 to the lower spreader 20. By connec/ting;4 the linlr 28 with the proper aperture 31 ot the rock-lever 30 in conformity with the selected position ot the needle l5 in the apertures 150 ot the needle-holder, the vibration ot the lower spreader has the proper timing; and extent of movement essential to produce any one of three substantially diilerent widths of bi pght of overseam.

An upper spreader 37 is disposed above and substantially parallel with the clothplate 2 and is adjustably secured by means of a screw 38 upon a grooved seat 39 provided in one arm 40 of a two-arianed rocking` carrier from which depends a substantially vertical ralorum-stud 41 preferably integral with the carrier 4D. rl`he tulcrum-stud 4l is pivotally supported within an apertured boss 42 and is retained therein by means of a screw 453 threaded. into the lower end oit the stud 4l. The apertured boss 42 projects substantially at right angles from the iree end ot a horizontal swinging arm 44 of a bellcranlt-lever disposed beneath the clothplate 2 and having a hub 45 journaled ugon a stud-screw 46 threaded into the under side ot the cloth-plate. The other arm 47 of the bellcranlr-lever 44, 47, is suitably connected to one end of a link 48 of which the opposite end is connected by meansv oil a screw 49 with any one of a plurality of apertures 50 formed in a lateral arm 5l, of which the hub 52 is pinned upon a vertical roch-shaft The rock-shaft 53 is journaled for oscillatory movements in suitable bearings provided in the 'machine frame, endwise movement of said rock-shaft being prevented on one end by the hub 52 and on its opposite end by the hub 54 or. another lateral arm 55 suitably clamped upon the roch-shaft. The arm 55 carries a roller-stud 56 entering a second cam-groove 57 in the cam-cylinder 36.

Rocking movements are imparted to the carrier 40 upon the swinging` arm 44 by connecting the arm 58 of said carrier 40, 58v with one endv ot a linlr 59 ot which the opposite end is pivoted upon the :tree end oi a lateral arm 50 suitably' clamped upon a vertical rock-shaft 6l. The rock-shaft (il is suit-ably journaled in the machine trame and carries another lateral arm 62 having a roller-stud 63 engaging a third cam-groove 64 provided in the cam-cylinder 36.

The upper spreader receives a curvilinear movement in a horizontal plane through the described connections with the cam-grooves 57, 64, the swinging' movements ol the arm 44 imparting endwise reciprocations to the spreader 37 across the margin .of the work .and the rocking movements ot the carrier 40, 58, impart lateral movements to said spreader to seize the needle-thread at the limit of its advancing movement and present a loop of said needle-thread to the bearded needle at the limit oi? its retracting movement. By connecting the linlr 48fwith the proper aperture 50 .of the arm 5l the operation o'f the upper spreader may be made to conform with the lower spreader 87 and the path of operation of the needle 15 to obtain any one of' three different widths of bigght ot overseam. Consequently, the present machine is readily convertible to produce several substantially diillerent widths of bight of overseam, thereby eliminating` the necessity oi constructing a machine for each width ot bight as was heretofore the case.

A circular throat-plate65 is secured by screws, as 65., in an opening provided therefor in the cloth-plate The throat-plate is itselt provided with a substantially rectangular needle-opening 57 havina a beveled rear edge 68.' Projecting within the opening; 67, -whereby its upper surface is substantially flush with the upper surtace ot the throat-plate is a stitch-retaining iinger 69 secured to the under side ot the throat-plate by means ot a screw 70. The free end ot this finger is beveled on its under side and is disposed slightly in advance ot the beveled edge 68, whereby the loops ot thread upon the under side oi the fabric will readily feed off the beveled surface ol" the finger 69 and up over the beveled ec gre 68 upon the throat-plate. The primary function of therlingerQ, however, is to prevent distortion of the work by the action of the lower spreader to draw out the needle'- thread loop, the lateral stress being absorbed by said finger.

vAdjustably secured upon the cloth-plate 2 by means of a screw 71 is a bearded-needle back-guide 72 having a notched tree end 7 3 positioned to engage the rear side or' the needle 15 to prevent rearward deflection oi' said needle underthe 4action of a beard-closing member 74. This beard-closing member 74 has a beard-engaging edge 7 5 and is secured by screws as 76 upon an edge-guide 77 adjustably secured by screws as 78 and an elongated slot 79 of said edge-guide upon the cloth-plate 2. The slot 79 is .somewhat wider than the screw-shankspassing therethrough whereby the edge-guide may be adjusted in transverse directions to determine the Awidth of the overseam as well as t-o correctly position the beard-engaging edge of the member 74.

In kthe operation of the machine, the eyepointed needle 14 penetrates the work and the bearded-needle 15 reciprocates beyond the work-margin.; Referring more particularly to Figs. 5 to 10, inclusive, the overseam is shown as being formed upon the work w, the needles 14 and 15 being at the top of their stroke in Fig. 5 and the bearded end of the needle 15 just clearing the back-guide, 72. In this position the lower loop-spreader 20 is being retracted and the upper loopspreader 37 has seized the thread carried by the eye-pointed needle 14 and has partially completed its movement to present an upper loop of thread a to the bearded needle 15 while the work is being fed past the needles.` In Fig. 6 the needles have partially descended and the upper spreader 37 has completed its loop-presenting movement whereby one limb of the loop ais passed under and behind the needle 15 while the other limb thereof remains yin front of the needle 15 due to the angle of said front limb from the spreader 37 to the eye of the needle 14. In Fig. 7 the needles have completed their descending movement and the lower spreader 20 its retracting movement, while the upper spreader is again advancing above the work.

As the needles now rise, a lower loop of thread is cast b y the needle 14 which is seized by the low-er spreader 2O and presented to the bearded needle 15 below the work as illustrated in 8. rIhe lateral stress produced by the drawing out of the lower loop 7) is absorbed by the stitch-retaining finger 69 to avoid distortion of the` work. The needles continuing to rise, the beard 15 of the needle 15 engages the end 75 of the block 74 and is closed by reason of the Jtact that the back-guide 72 opposes any yield of the needle 15. This position is illustrated in Fig. 9 and it will be apparent that as the needles continue to rise the` closed beard of the needle 15 will readily slip through the upper loop a and through a previously `formed lower' loop b about the shank of the needle 15, as shown in Fig. 10,

thereby'enchaining the lower loops at the margin of the work while the upper loop is held by the enchained lower loops. It is olf course to be understood that also during the 75 descending movement of the needle 15 is the beard 15 closed by engagement with the bloc-k 75, ybut this occurs just after the lower loop Z) has slipped past the beard 15 upon the shank of the needle y15.

Having thus set forth the nature of the invention, what we claim herein is 1. Inan overedge sewingy machine, the combination with stitch-forming mechanism including a thread-carrying eye-pointed necdle and a threa'd-enchaining bearded needle reciprocating substantially in unison in adjustably spaced paths, and loop-spreaders cooperating with said needles to produce an overseam of substantially uniform 4width o1 bight, of means for actuating said ,loopspreaders including connections permanently mounted in the machine convertible to produce substantially different v widths vof vbight of overseam.

2. In a stitch-forming mechanism for overedge sewing machines, the combination with an eye-pointed work-penetrating needle,'an ov-er-the-edge operating bearded needle, means for reciprocating said needles, and a lower spreader for presenting a threadloop below the work from said eye-pointed needle to said bearded needle, of an upper spreader for conducting a thread-loop above the work from said eye-pointed needle to .105 said bearded needle, a swinging arm, a pivotal support for said arm, apivotal support for said upper spreader uponsaid arm, a rotary cam. operative connections between the cam and said arm for vibrating the latter, and means including another rotary cam for rocking said upper spreader upon said arm. e f

3. Stitch-forming mechanism for overedge sewing machines comprising in combination, a thread-carrying eye-pointed needle and a thread-enchaining bearded needle, means for reciprocating saidk needles substantially in unison, upper and lower spreaders disposed respectively above and below the work for carrying thread-loops from the eye-pointed needle to the bearded needle, means for aetuating said lower spreader, a rocking carrier sustaining saidv upper spreader, a swinging armupon which said carrier is fulcrumed, a rotary shaft, `and actuating conn-ections independent of each other between said shaft and the swinging arm and said rocking carrier.

4. In a sewing machine., the combination with a. cloth-plate, an overhanging arm, and a rotary shaft journaled in said overhanging arm, of overedge stitch-'forming mechanism comprising a thread-carrying eye-pointed needle and a thread-enchaininp; bearded needle, operative connections with said rotary shaft 'for reciprocating` said needles substantially in unison, upperl and lower spreaders disposed respectively above land below said cloth-plate li'or carrying` threadeloops from the eye-pointed needle to the bearded needle, a vibratory carrier for said lower spreader' ulcrumed beneath the cloth-plate, means for vibrating` said carrier, a rocking-carrier sustaining said upper spreader, a swinging arm pivotally supported beneath said sloth-plate upon vif'liich said rocking carri-er is fulcruined, means 'for swinging said arm, and means for rocking said carrier upon said arm.

5. ln a sewing machine, the combination with a cloth-plate, an overliringing,` arm, and a rotary shaft journaled in said overhanging arm, or overedge stitch-forming mechanism comprising al thread-carrying eye-pointed needle and a thread-enchaining1, ,bearded needle7 operative connections with said rotary shaft for reciprocating said needles substantially in unison, upper and lower spreaders disposed respectively above and below said cloth-plate for carryingthread-loops from the eye-pointed needle to the bearded needle, a vibratory carrier 'for said lower spreader ulerumed beneath the cloth-plate, means `for vibrating` said carrier, a rocking'carrier tor said upper spreader, a bellcranlrlever, a pivotal support for said lever beneath the cloth-plate, a pivotal support for said can rier upon said lever, a cam carried by said shaft, operative connections between said cam and one arm of said lever to rock the latter upon its ulerum, and means for roel;- ing;` said carrier upon the other arm ot said lever.

6. ln an overedge sewing machine, in Combination, adjustably spaced eye-pointed and bearded needles, means 'tor reciprocating said needles, upper and lower loop-spreaders 'for carrying threaddoops from said eye-pointed needle above and below the work for enA chainment by said bearded needle at the man gin olf the work, means for vibrating said lower spreader including connections convertible to vary the path ot movement of said lower spreader a predetermined extent, means for actua-ting said upper spreader in sul stantially transverse directions including connectionsConvertible to vary the .path ot movement ot said upper spreader a predetermined extent in one of said directions.

ln testimony whereof, we have signed'our naines to this specification.

ALFRED Gerne. Josnrn r. PALME. 

